Projection micro-document reading lamp device



July 3l, 1951 G. coRDoNNlER 2,562,297

'PROJECTION MIcRoDoCUMENT READING LAMP DEVICE Filed Aug. 1, 194e 2sheets-sheet I July 31, 1951 G. coRDONNn-:R 2,562,297 PROJECTIONMICRODOCUMENT READING LAMPDEVICE Filed Aug. l, 1946 A 2 Sheets-Sheet 2{Ng/m N? tw y /RT l m/ /1 for Patented July 31, 1951 PRGJECTION.MICRO-DOCUMENT. READING LAMP DEVICE Grardl'Cbrdonnier, Paris, France-Application.Augustv 1, 1946, Serial-No. 687,557' In France July 7,19432.V

Sectonf1`,Pullic`-Law 690, August 8, 1946 Patentiexpires July 7A, 1962i1v The' present invention relates to'v a. micro reading lampi designedfor thev examination or pho-- togra-phsio. smallrscala. and allmicrodocuments.;

easeV of a collective examinationof documents.,

but rather small in the case of' Ian individual examination. 'I-he imageis:A projected either on a. nearly vertical'screen or on an=almosthorizon-e tal screen above awork tabl/e.V In certain of. theseapparatus the light beams. areformed. in, one" or several mirrors;`

In all cases-the image must bethoroughly protected againstexternaldiiuse.; light, and. a

relative: darkness ispreferable. in thenprojection room, or theindividualscreen'mustbe protectedb'ywalls encumbering.y the work table.-In the two cases there results animportant annoy-anca,r

not allowing the immediate examination-ofmiero:

documents without-interrupting the work.V

It must be addedy tothe detriment of individuali apparatus, that theirarrangement is gent orally such tha-t the` microt document is placedtooA high above the work table and that its manipulationcan leadto agfreatffatig-,ue of thearms.-v

The1 second typek of 'apparatus monocular or. binocular,y lenses ormicroscopes, for-In a virtual image sulciently-luminous-notz-toneedexamination in darknessl A lens is relatively cheapbut of-v mediocrevoptica-l quality, and its defects/onthe borders` of the ileld produceran intenseY fatigue after'aprolonged reading:

A- binocular microscope of higlr price: doesnot. producemuchfatig-uerand the operator is capable of effecting a regulationthereof perfectly adapted. to his vision. But the eyes must then` have avery precisel position corresponding tothe ocular rings of theinstrument. Thefxfity of the headVr thusdemanded quickly becomes.extremely painful andf generally incompatible with the' freedom of; mindnecessary tofbrain. work.

It is apparent fromthe preceding,l descriptions thatr` the.differentmicroread-ing. apparatus` are not at; all adaptablei-nVpractice on. account of,`

th'eir different inconveniences, includingk obligation to darken theWork room', encumbranceof the desk, difficulties of manipulation,fatigue of examination.

That is why micro documentation, in spite of itsadvantagesfor thediffusion;4 thei conservation andfthe classification of documents hasonly beenl regarded' hitherto as: a helping: means only tol bevemployed: in the casev where it is possibleI tos. procure documentsedited-Y tof the usual dimen-f-e sions. f

@ne ofv theessential objects. of the present iii-- vention is to.obtainl al new arrangement. ofk known elements avoiding entirely theforegoing'. inconveniences: and realizing Yat the same: timeother"possibilities. The usev of apparatuswith eyepieces beingincompatible with. a' prolonged-l and comfortable* reading the newapparatus is of. the projection' type.` Butto avoid the'incon-fveniences noted-ly above, thei projectedimage will" beY rendered'virtual without at the same time? introducing: eyepieces Amongst theadvantages-- which result from this arrangement willvbe'men-f' tion'ed:theV` possibility of placing. withinreachf. the mechanism ofmanipulation, and of suppressing-^ the encumbrance of'v the-screenand.Yofthe hood;` walls which aren no longerl found* in theL working zone.

According toene example theY projection lamp forms the pedestal'4 of theinstrument, the imageis projected on to a horizontal screen suspendedvfrom or carriedbylight mountings connecting it either to.l the pedestalof the instrument or.l at the work table. This screen is protected by"a. suspendedV hood such: that theY feeble' diff-use light coming fromythe* work tablecan reachvthehscreen; with the` exclusionA of: th'edirectA light.- from thef windows.

readingy by invalidsinbedI or ini: a longr chairby installingtheapparatuslas aI bedside lamp in. the-y immediater neighbourhood ofthe reader, the

screenfbeing-Isuspendedfabove?theheadat a suitable distance;

Fory normal reading a small mirror connected: to theorientable-pedestal- 'and` placed at eye levelfl before* or.' behindlthe projecting beam of. light.:

gives finally' a virtualY imagefof the magnified document inclinedbefore the observer.

of his eld of vision.

Ai manipulation.atI eas-y distance` of. therA docul ment or of themirror will permit him to make pass before him any part of the documentin proportion to his reading.

The platform supporting the micro documents will be provided to pass thestandard microl'llrns or any other assembly of micro copies such as amicro slide of usual size 105 x 148 presenting four ranges of 8 microcopies corresponding to 32 pages of text. In this latter case auxiliaryapparatus permit without regulation, of examining automatically such orsuch page and of passing automatically to the following.

One might thus for example, only read, in a sequence of slides to beexamined, the first pages giving summaries or the last givingconclusions of the elements reproduced. This whole of known elementaryarrangements leads thus to obtaining an apparatus allowing a more rapidand more comfortable consultation of documents.

It goes without saying that other complen mentary apparatus can easilybe adjoined to the micro reader without forming an invention distinctfrom the first. One might thus for example examine moving images orimages in relief.

Finally to annul completely the practical encumbrance of the microreader which can moreover be dismountable for its transport, the Wholecan be provided to replace advantageously one of the accessories of thework table, the portable lamp. In fact in absence of the micro document,with or Without an objective (shuleable for ex ample) the condenser ofthe lamp could project on the upper screen all the light from the lamp.I'he screen will diffuse this light on the work table and in a limitedeld around it. This indirect lighting will be of a yield much superiorto that of the usual lamps lighting uselessly the ceiling whiledispersing exaggeratedly the light. There will be obtained thus alighting conforming to hygienic vision and which will be at the sametime in accordance with the orders for passive defence.

By way of example and to facilitate the understanding of thedescription, there have been shown in the appended drawings.

Fig. 1 is a schematic View of the whole of an apparatus according to theinvention.

Fig. 2 is the View in lateral elevation of a slide :carrying framedestined to be used in this apparatus.

Fig. 3 is a lateral View in partial sectional elevation showing how theslides for receiving the frame are arranged.

In this example the optical system, diagrammati-cally represented as I,can comprise as is well known a lamp with or without a mirror, acondenser in one or several pieces and an objective 2 forming a realimage on the screen 3.

The screen will be formed by a plaque made of any suitable materialresting on lateral straight edges 8, in the form of angle irons whichare supported by vertical mountings 9. These mountings and angle ironsare preferably dismountable and foldable so as to be capable of beinglodged as well as the screen in a work portfolio or a trunk of smalldimensions. The mountings are for example mounted by ample sinking downof their lower extremities on the box I containing the projectionmechanism so thatthe Whole apparatus may be easily displaceable and maybe arranged on any table or desk. But the screen could equally well becarried by the table or xed.

It is to be remarked that the mounting of the 4 screen on two Verticalmountings only leaves possible slight lateral displacements of thescreen which do not imply appreciable alteration of distance relative tothe objective of the projection apparatus so that lateral movements ofthe screen, possible by reason of the lightness of the mountings willnot produce any defect of focusing nor of apparent displacement of theimage capable of producing eye strain. The screen 3 is surrounded by ahood 4 of fabric which protects it from diffused light.

The mirror 5 of regulable position allows of examining the projection byits virtual image. This mirror is preferably mounted on a strap I0pivoting around a vertical axis a-a which allows the observer to placehimself either directly opposite, or on one side, and can particularlybe advantageous for the examination of micro documents legibledownwardly and across.

Preferably the mirror is mounted in conditions such that its edge I Icoincides approximately with one edge of the beam of light. Thisarrangement is most favourable to a non-oblique observation of the imageprojected on the screen 3. In the example represented the mirror ismounted by the aid of a rod 22 sliding parallel to the limit plane p--pof the beam of light and pivoting on a horizontal axis I I whichcoincides exactly with the side of the beam of light so that theobserver can read the document under the best conditions whatever may bethe height and the orientation in which he places the mirror.

The apparatus can comprise moreover an auxililary mirror 23 mounted forexample on the support I0 and capable of turning itself into theposition indicated in dotted lines on the drawing to project thedocument no longer on screen 3 but on an auxiliary screen, mural forexample, for direct visibility by a large number of persons. Thisarrangement Will be particularly suited to conferences.

The bowl containing the lamp carries on the other hand an opening frameI2 in which is arranged the micro document I'3. This frame, visible inFig. 2 is composed preferably of a frame proper i4 provided with a glassI5 and. with a glazed cover IB- which opens by rotation around a hingeI1. The cover I6 is connected to the hinge I'I by leaf springs I8 sothat its parallelism to the glass I5 is assured whatever may be thethickness of the micro document I3. The frame thus constituted issupported by slides I9 which allow of its sliding from front to back andWhich are themselves mounted on a second set of slides 20 allowingdisplacement laterally. It is thus possible by a displacement of theframe effected by hand to make to pass successively under the objectivethe different pages of a photographic work on the micro document or thedifferent parts of the View of a whole.

Although the present invention has been described in relation to amethod of carrying it out it is clear that it is in no way limited tothe said example, that the latter is capable of variations andmodifications which will be apparent to the expert.

I claim:

1. An apparatus for the observation of microdocuments comprising incombination: a casing, a projection apparatus therein capable of beingplaced upon the work table of the operator, a supporting plate holderfor the micro-documents, an opaque screen protected from diffused lightfor receiving the projected image of the micro-documents, meanssupporting said opaque screen in projection position above theprojecting apparatus, reflecting mirror means located above and at oneside of the projection apparatus between the latter and the screen andin the eld of the sight of the operator whereby the projected images onthe screen may be viewed.

2. An apparatus as set forth in claim 1 wherein a hood surrounds saidscreen to protectit from exterior light.

3. In an apparatus as set forth in claim 1, a micro-document carryingframe comprising two frames proper which are glazed, one being mountedon the other by means of a hinge and one of said frames being connectedto said hinge by leaf springs.

4. An apparatus for the observation of microdocuments comprising incombination: a casing, a projection apparatus the-rein capable of beingplaced upon the work table of the operator, a supporting plate holderfor the micro-documents, an opaque screen protected from diffused lightfor receiving the projected image of the micro-documents, meanssupporting said opaque screen in projection position above theprojecting apparatus, reflecting mirror means located above and at oneside of the projection apparatus between the latter and the screen andin the field of the sight of the operator whereby the projected imageson the screen may be viewed, and means for adjusting the position andorientation of said mirror.

5. An apparatus for the observation of micro-Y documents comprising incombination: a casing, a projection apparatus therein capable of beingplaced upon the work table of the operator, a supporting plate holderfor the micro-documents, an opaque screen protected from diffused lightfor receiving the projected image of the microdocuments, meanssupporting said opaque screen in projection position above theprojecting apparatus, reflecting mirror means located above and at oneside of the projection apparatus between the latter and the screen andin the field of the sight of the operator whereby the projected imageson the screen may be Yviewed and two mountings for said screensubstantially parallel to the projection axis.

6. An apparatus for the observation of microdocuments comprising vincombination: a casing, a projection apparatus therein capable of beingplaced upon the work table of the operator, a supporting plate holderfor the micro-documents, an opaque screen protected from diffused lightfor receiving the projected image of the microdocuments, meanssupporting said opaque screen in projection position above theprojecting apparatus, reiiecting mirror means located above and at oneside of the projection apparatus between the latter and the screen andin the eld of the sight of the operator whereby the projected images onthe screen may be viewed, and two substantially vertical mountings forsaid screen, said mountings being dismountable and carried by theprojection apparatus.

7. An apparatus for the observation of microdocuments comprising incombination: a casing, a projection apparatus therein capable of beingplaced upon the work table of the operator, a supporting plate holderfor the micro-documents, an opaque screen protected from diffused lightfor Ireceiving the projected image of the microdocuments, meanssupporting said opaque screen in projection position above theprojecting apparatus, reflecting mirror means located above and at oneside of the projection apparatus between the latter and the screen andin the field of the sight of the operator whereby the projected imageson the screen may be viewed, a strap mounted to pivot about a verticalaxis and said reiiecting mirror means being mounted on said strap topivot about a horizontal axis.

8. An apparatus for the observation of micro-documents comprising incombination: a casing, a projection apparatus therein capable of beingplaced upon the work table of the operator, a supporting plate holderfor the micro-documents, an opaque screen protected from diused lightfor receiving the projected image of the micro-documents, meanssupporting said opaque screen in projection position above theprojecting apparatus, reflecting mirror means located above and at oneside of the projection apparatus between the latter and the screen andin the eld of the sight of the operator whereby the projected images onthe screen may be viewed, and said refleeting mirror means having oneedge thereof nearest the light beam and being limited in its movementthereby.

GRARD CORDONNIER.

REFERENCES CITED The following references are of record in the file ofthis patent: v

UNITED STATES PATENTS Number Name Date 1,332,413 Robertson Mar. 2, 19201,460,600 Palmer July 3, 1923 1,624,816 Triana et al. Apr. 12, 19271,870,823 Ross Aug. 9, 1932 1,889,575 Sebille Nov. 29, 1932 1,894,004Rose Jan. 10, 1933 1,951,054 Kennedy Mar. 13, 1934 1,974,654 May Sept.25, 1934 1,994,543 Stenz et al Mar. 19, 1935 2,008,982 Hopkins July 23,1935 2,174,778 Croft Oct. 3, 1939 2,254,368 Holbrook Sept, 2, 19412,258,382 `Goebel Oct. 7, 1941 2,361,398 Harris et al. Oct. 31, 19442,369,248 Pratt Feb. 13, 1945

